阅读说明：本技术 一种离合器滑磨点初始位置参数阈值的标定方法 (Calibration method for initial position parameter threshold of clutch sliding friction point ) 是由 衣超 李志伟 李翠芬 冯光军 王佳婧 王叶 韩宇石 徐飞 李慧渊 郭婷 刘振杰 于 2020-05-08 设计创作，主要内容包括：本发明公开了一种离合器滑磨点初始位置参数阈值的标定方法,属于汽车传动技术领域。该方法实现的步骤如下：首先标定装置对电磁阀和传感器的信号状态进行检测,其次标定装置判断并监控标定状态安全性,然后进行离合器滑磨点初始位置参数标定；最后进行离合器滑磨点初始位置参数标定值计算与确认；标定装置依据记录的离合器分离滑磨点和结合滑磨点计算离合器滑磨点初始位置参数标定值,并与理论阈值进行比对确认,保证离合器滑磨点初始位置参数阈值设置的准确性。本发明的标定方法通过对观测值的简单计算并结合理论值校验,简单、高效、安全的实现了离合器滑磨点初始位置参数阈值的有效标定。(The invention discloses a method for calibrating a parameter threshold value of an initial position of a sliding friction point of a clutch, and belongs to the technical field of automobile transmission. The method comprises the following steps: firstly, a calibration device detects signal states of an electromagnetic valve and a sensor, secondly, the calibration device judges and monitors the safety of the calibration state, and then the initial position parameter calibration of a clutch sliding friction point is carried out; finally, calculating and confirming the calibration value of the initial position parameter of the clutch sliding and grinding point; the calibration device calculates the calibration value of the initial position parameter of the clutch sliding point according to the recorded clutch separation sliding point and the recorded combined sliding point, and compares the calibration value with a theoretical threshold value for confirmation, so that the accuracy of the setting of the initial position parameter threshold value of the clutch sliding point is ensured. The calibration method provided by the invention realizes effective calibration of the initial position parameter threshold of the clutch sliding friction point simply, efficiently and safely by simple calculation of the observed value and combined with theoretical value verification.)

1. A calibration method for initial position parameter threshold of clutch sliding friction point is characterized by comprising the following steps:

firstly, a calibration device detects signal states of an electromagnetic valve and a sensor; the calibration device receives a clutch electromagnetic valve, a clutch position, a neutral position, an engine rotating speed signal, an input shaft rotating speed signal and a hand brake signal which are uploaded by the TCU through a bus, diagnoses the signal health state and determines whether the calibration work can be carried out or not;

step two, the calibration device judges and monitors the safety of the calibration state; determining whether the current vehicle state meets a calibration safety condition or not according to the hand braking state and the neutral position signal, if so, entering a calibration flow, and monitoring the safety of the calibration state;

step three, calibrating the initial position parameters of the sliding and grinding point of the clutch; the calibration device sends a calibration instruction to the clutch electromagnetic valve according to a preset calibration flow sequence, collects a clutch position signal, an engine rotating speed signal and an input shaft rotating speed signal according to a preset calibration flow, calculates the total amount of the rotating speed change of the input shaft, and determines a clutch separation sliding grinding point and a clutch combination sliding grinding point;

calculating and confirming the calibration value of the initial position parameter of the clutch sliding and grinding point; the calibration device calculates the calibration value of the initial position parameter of the clutch sliding point according to the recorded clutch separation sliding point and the recorded combined sliding point, and compares the calibration value with a theoretical threshold value for confirmation, so that the accuracy of the setting of the initial position parameter threshold value of the clutch sliding point is ensured.

2. The method for calibrating the initial position parameter threshold of the clutch slipping point as defined in claim 1, wherein the process of calculating the total amount of change in the rotational speed of the input shaft and determining the clutch disengagement slipping point and the clutch engagement slipping point in step three is as follows: the calibration device outputs a clutch separation instruction to the electromagnetic valve of the clutch, controls the clutch to be slowly separated, collects and records signals of an engine rotating speed sensor (ne), an input shaft rotating speed sensor (ni) and a clutch displacement sensor (X), calculates the total rotating speed change amount (Si) of the input shaft according to the following formula,

Si＝∫(ne-ni)dt

judging whether the total change amount (Si) of the rotating speed of the input shaft is greater than a set threshold value (Si _ open) of the total change amount of the rotating speed of the input shaft when the clutch is disengaged, if not, continuously outputting a clutch disengaging command, controlling the clutch to slowly disengage, and calculating the total change amount (Si) of the rotating speed of the input shaft; if the total change amount of the rotating speed of the input shaft (Si) is larger than the set threshold value Si _ open, recording a clutch displacement sensor signal (X) at the moment when the total change amount of the rotating speed of the input shaft (Si) is larger than the set threshold value Si _ open as a clutch separation sliding-grinding point X1; then judging whether the rotating speed of the input shaft is zero or not according to the collected signals (ni) of the rotating speed sensor of the input shaft, and if the rotating speed of the input shaft is not zero, continuously judging whether the rotating speed of the input shaft is zero or not; if the rotating speed of the input shaft is zero, the calibration device outputs a clutch combination instruction to the electromagnetic valve of the clutch, controls the combination of the clutch, collects and records a sensor signal (ni) of the rotating speed of the input shaft and a sensor signal (X) of the displacement of the clutch, and calculates the total change amount (Si) of the rotating speed of the input shaft according to the following formula, wherein Si ═ ^ dt

Judging whether the total change amount (Si) of the rotation speed of the input shaft is greater than a set threshold value Si _ close, if not, continuously outputting a clutch combination instruction, controlling the clutch to be combined, and calculating the total change amount (Si) of the rotation speed of the input shaft; if the total amount of change in the input shaft rotational speed (Si) is greater than the set threshold value Si _ close, the clutch displacement sensor signal (X) is recorded as a clutch engagement slip point X2 when the total amount of change in the input shaft rotational speed (Si) is greater than the set threshold value Si _ close.

3. The method for calibrating the initial position parameter threshold value of the clutch slipping point as claimed in claim 2, wherein the calculation and confirmation of the initial position parameter calibration value of the clutch slipping point in the fourth step are as follows: the calibration device calculates the initial parameter calibration value of the clutch slip point according to the following formula according to the clutch separation slip point X1 and the clutch combination slip point X2:

X＝(X1+X2)/2

comparing the initial parameter calibration value of the clutch sliding-grinding point with a theoretical threshold value, determining whether the initial parameter calibration value of the clutch sliding-grinding point is reasonable, if not, judging whether the calibration cycle is more than three times, and if not, repeating the step three; if the number of the calibration processes is more than three, ending the calibration process and exiting the calibration program; and if the calibration value of the initial parameter of the clutch sliding-grinding point is reasonable, the calibration value X of the initial parameter of the clutch sliding-grinding point is the threshold value of the initial parameter of the clutch sliding-grinding point.

Technical Field

The invention relates to a method for calibrating a parameter threshold value of an initial position of a sliding friction point of a clutch, belonging to the technical field of automobile transmission.

Background

With the popularization and application of vehicles equipped with AMT transmissions in the field of commercial vehicles, the research and development of AMT transmissions are more fierce, various research institutes and transmission production enterprises develop various models and develop a large number of practical vehicle examination tests, the commercialization prospect of the AMT transmissions is more and more clear, the AMT transmissions become an important direction for the advance of the automatic technology of the transmissions in the automotive field in China, and the AMT transmissions play a very important role in the development of the automotive transmission technology.

Vehicles equipped with AMT transmissions may have large differences in initial positions of clutch wear points on different vehicles due to manufacturing and assembly variations of the clutches. If the initial position parameter threshold of the clutch sliding friction point cannot be accurately defined, the deviation of the transmission torque of the clutch can be caused, and the vehicle starting and gear shifting impact can be caused by a light person to influence the gear shifting quality of the vehicle; the heavy person causes abnormal wear of the clutch, and the service life of the clutch is influenced. The calibration method for the parameter threshold of the initial position of the slipping point of the AMT clutch is designed and developed, the accurate calibration of the parameter threshold of the initial position of the slipping point of the AMT clutch is realized on the premise of ensuring the safety of the calibration process, and the method plays a great promoting role in accelerating the popularization and application of the AMT transmission in the field of commercial vehicles.

Disclosure of Invention

In view of this, the present invention provides a calibration method for a clutch slipping point initial position parameter threshold, by which an actual vehicle calibration for the clutch slipping point initial position parameter threshold can be realized according to an engine rotation speed signal, an input shaft rotation speed signal, a hand brake signal, a clutch position signal and a neutral position signal collected by an Automated Mechanical Transmission (AMT) control unit.

A calibration method for initial position parameter threshold of clutch sliding friction point comprises the following steps:

firstly, a calibration device detects signal states of an electromagnetic valve and a sensor; the calibration device receives a clutch electromagnetic valve, a clutch position, a neutral position, an engine rotating speed signal, an input shaft rotating speed signal and a hand brake signal which are uploaded by the TCU through a bus, diagnoses the signal health state and determines whether the calibration work can be carried out or not;

step two, the calibration device judges and monitors the safety of the calibration state; determining whether the current vehicle state meets a calibration safety condition or not according to the hand braking state and the neutral position signal, if so, entering a calibration flow, and monitoring the safety of the calibration state;

step three, calibrating the initial position parameters of the sliding and grinding point of the clutch; the calibration device sends a calibration instruction to the clutch electromagnetic valve according to a preset calibration flow sequence, collects a clutch position signal, an engine rotating speed signal and an input shaft rotating speed signal according to a preset calibration flow, calculates the total amount of the rotating speed change of the input shaft, and determines a clutch separation sliding grinding point and a clutch combination sliding grinding point;

calculating and confirming the calibration value of the initial position parameter of the clutch sliding and grinding point; the calibration device calculates the calibration value of the initial position parameter of the clutch sliding point according to the recorded clutch separation sliding point and the recorded combined sliding point, and compares the calibration value with a theoretical threshold value for confirmation, so that the accuracy of the setting of the initial position parameter threshold value of the clutch sliding point is ensured.

Further, the process of calculating the total amount of change in the rotation speed of the input shaft and determining the clutch disengagement slip point and the clutch engagement slip point in the third step is as follows: the calibration device outputs a clutch separation instruction to the electromagnetic valve of the clutch, controls the clutch to be slowly separated, collects and records signals of an engine rotating speed sensor (ne), an input shaft rotating speed sensor (ni) and a clutch displacement sensor (X), calculates the total rotating speed change amount (Si) of the input shaft according to the following formula,

Si＝∫(ne-ni)dt

judging whether the total change amount (Si) of the rotating speed of the input shaft is greater than a set threshold value (Si _ open) of the total change amount of the rotating speed of the input shaft when the clutch is disengaged, if not, continuously outputting a clutch disengaging command, controlling the clutch to slowly disengage, and calculating the total change amount (Si) of the rotating speed of the input shaft; if the total change amount of the rotating speed of the input shaft (Si) is larger than the set threshold value Si _ open, recording a clutch displacement sensor signal (X) at the moment when the total change amount of the rotating speed of the input shaft (Si) is larger than the set threshold value Si _ open as a clutch separation sliding-grinding point X1; then judging whether the rotating speed of the input shaft is zero or not according to the collected signals (ni) of the rotating speed sensor of the input shaft, and if the rotating speed of the input shaft is not zero, continuously judging whether the rotating speed of the input shaft is zero or not; if the rotating speed of the input shaft is zero, the calibration device outputs a clutch combination instruction to the electromagnetic valve of the clutch, controls the clutch to be slowly combined, collects and records a rotating speed sensor signal (ni) of the input shaft and a displacement sensor signal (X) of the clutch, calculates the total rotating speed change amount (Si) of the input shaft according to the following formula,

Si＝∫(ni)dt

judging whether the total change amount (Si) of the rotation speed of the input shaft is greater than a set threshold value Si _ close, if not, continuously outputting a clutch combination instruction, controlling the clutch to be slowly combined, and calculating the total change amount (Si) of the rotation speed of the input shaft; if the total amount of change in the input shaft rotational speed (Si) is greater than the set threshold value Si _ close, the clutch displacement sensor signal (X) is recorded as a clutch engagement slip point X2 when the total amount of change in the input shaft rotational speed (Si) is greater than the set threshold value Si _ close.

Further, the calculation and confirmation process of the calibration value of the initial position parameter of the sliding friction point of the clutch in the fourth step is as follows: the calibration device calculates the initial parameter calibration value of the clutch slip point according to the following formula according to the clutch separation slip point X1 and the clutch combination slip point X2:

X＝(X1+X2)/2

comparing the initial parameter calibration value of the clutch sliding-grinding point with a theoretical threshold value, determining whether the initial parameter calibration value of the clutch sliding-grinding point is reasonable, if not, judging whether the calibration cycle is more than three times, and if not, repeating the step three; if the number of the calibration processes is more than three, ending the calibration process and exiting the calibration program; and if the calibration value of the initial parameter of the clutch sliding-grinding point is reasonable, the calibration value X of the initial parameter of the clutch sliding-grinding point is the threshold value of the initial parameter of the clutch sliding-grinding point.

Has the advantages that:

1. the method is based on the information of the AMT vehicle such as the engine rotating speed signal, the input shaft rotating speed signal, the hand braking signal, the clutch position signal, the neutral position signal and the like, and realizes effective calibration of the initial position parameter threshold of the clutch sliding friction point simply, efficiently and safely by simple calculation of an observed value and combined with theoretical value verification.

2. In the third step of the invention, the total amount of the change of the rotating speed of the input shaft is calculated according to a formula by acquiring and recording signals of an engine rotating speed sensor, signals of an input shaft rotating speed sensor and signals of a clutch displacement sensor, and a clutch separation sliding point and a clutch combination sliding point are determined. The method introduces the concept of total variation, so that calibration errors caused by the problems of noise and the like of the acquired rotating speed signals can be effectively avoided; the two sliding points are designed to be separated and combined, so that unreasonable calibration of the sliding points caused by factors such as mechanical hysteresis, hydraulic hysteresis and the like in the separation or combination process can be avoided.

3. Comparing the calibration value of the initial parameter of the sliding point of the clutch with a theoretical threshold value, determining whether the calibration value of the initial parameter of the sliding point of the clutch is reasonable or not, if not, judging whether the calibration cycle is more than three times or not, and if not, repeating the step three; if the number of the calibration processes is more than three, the calibration process is ended. By comparing the calibration value of the initial parameters of the sliding friction point of the clutch with the theoretical threshold value, the calibration parameters can be ensured to be in a reasonable range, and the possibility that the calibration parameters are unreasonable due to abnormal data acquisition is eliminated. The cycle number is mainly to improve calibration efficiency, if the calibration work can not be completed in three times of attempts, the clutch has problems and needs to be overhauled.

Drawings

FIG. 1 is a block diagram of a system for calibrating a threshold value of an initial position parameter of a clutch slip point;

FIG. 2 is a flow chart of a clutch slip point initial position parameter threshold calibration;

FIG. 3 is a schematic diagram illustrating changes in input shaft speed and clutch displacement during clutch disengagement;

FIG. 4 is a schematic diagram illustrating changes in input shaft speed and clutch displacement during clutch engagement.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

The invention provides a method for calibrating a parameter threshold value of an initial position of a clutch sliding friction point, which comprises the following steps of:

step 101: the calibration device detects signal states of the electromagnetic valve, the sensor and the like; the calibration device receives signals of a clutch electromagnetic valve, a clutch position, a neutral position, an engine rotating speed signal, an input shaft rotating speed signal, a hand brake and the like uploaded by the TCU through a bus, diagnoses the health state of the received signals, and if the signal state is abnormal, carries out fault removal on a fault electromagnetic valve or a sensor and carries out re-diagnosis; if the signal state is normal, entering step 102;

step 102: the calibration device judges and monitors the safety of the calibration state; judging whether the vehicle is braked or not according to the collected hand braking state signal, if the vehicle is not braked, braking the hand brake, and judging whether the hand brake is braked again; if the transmission is not in the neutral position, a transmission neutral position changing instruction is sent to the TCU, and whether the transmission is in the neutral position is judged again; if the transmission is in neutral, then step 103 is entered;

step 103: calibrating the initial position parameters of the sliding and grinding point of the clutch; the calibration device outputs a clutch separation instruction to the electromagnetic valve of the clutch, controls the clutch to be slowly separated, collects and records signals of an engine rotating speed sensor (ne), an input shaft rotating speed sensor (ni) and a clutch displacement sensor (X), calculates the total rotating speed change amount (Si) of the input shaft according to the following formula,

Si＝∫(ne-ni)dt

judging whether the total change amount (Si) of the rotating speed of the input shaft is greater than a set threshold value (Si _ open) of the total change amount of the rotating speed of the input shaft when the clutch is disengaged, if not, continuously outputting a clutch disengaging command, controlling the clutch to slowly disengage, and calculating the total change amount (Si) of the rotating speed of the input shaft; if the total change amount of the rotating speed of the input shaft (Si) is larger than the set threshold value Si _ open, recording a clutch displacement sensor signal (X) at the moment when the total change amount of the rotating speed of the input shaft (Si) is larger than the set threshold value Si _ open as a clutch separation sliding-grinding point X1; then judging whether the rotating speed of the input shaft is zero or not according to the collected signals (ni) of the rotating speed sensor of the input shaft, and if the rotating speed of the input shaft is not zero, continuously judging whether the rotating speed of the input shaft is zero or not; if the rotating speed of the input shaft is zero, the calibration device outputs a clutch combination instruction to the electromagnetic valve of the clutch, controls the clutch to be slowly combined, collects and records a rotating speed sensor signal (ni) of the input shaft and a displacement sensor signal (X) of the clutch, calculates the total rotating speed change amount (Si) of the input shaft according to the following formula,

Si＝∫(ni)dt

judging whether the total change amount (Si) of the rotation speed of the input shaft is greater than a set threshold value Si _ close, if not, continuously outputting a clutch combination instruction, controlling the clutch to be slowly combined, and calculating the total change amount (Si) of the rotation speed of the input shaft; if the total change amount of the input shaft rotating speed (Si) is larger than the set threshold value Si _ close, recording a clutch displacement sensor signal (X) at the moment when the total change amount of the input shaft rotating speed (Si) is larger than the set threshold value Si _ close as a clutch combination slip point X2; then step 104 is entered;

step 104: calculating and confirming the initial position parameter calibration value of the clutch sliding friction point; the calibration device calculates the initial parameter calibration value of the clutch slip point according to the following formula according to the clutch separation slip point X1 and the clutch combination slip point X2:

X＝(X1+X2)/2

comparing the initial parameter calibration value of the clutch sliding-grinding point with a theoretical threshold value, determining whether the initial parameter calibration value of the clutch sliding-grinding point is reasonable, if not, judging whether the calibration cycle is more than three times, and if not, repeating the step 103; if the number of the calibration processes is more than three, ending the calibration process and exiting the calibration program; and if the calibration value of the initial parameter of the clutch sliding-grinding point is reasonable, the calibration value X of the initial parameter of the clutch sliding-grinding point is the threshold value of the initial parameter of the clutch sliding-grinding point.

FIG. 3 is a schematic diagram of changes in input shaft speed and clutch displacement during clutch disengagement. The abscissa is a time axis, and the ordinate is the rotating speed and the displacement value of the clutch; in the initial stage, the displacement value of the clutch is maximum, the rotating speed of the engine is the same as that of the rotating shaft, and the clutch is completely combined; the displacement value of the clutch is gradually reduced along with the clutch separation instruction output to the electromagnetic valve of the clutch by the calibration device, and when the displacement value of the clutch is reduced to a certain point, the rotating speed of the input shaft is gradually reduced until the rotating speed is zero; and when the total change amount of the input shaft rotating speed is larger than a set threshold value, the corresponding clutch displacement value is the clutch separation slip point.

FIG. 4 is a schematic diagram of changes in input shaft speed and clutch displacement during clutch engagement. The abscissa is a time axis, and the ordinate is the rotating speed and the displacement value of the clutch; in the initial stage, the displacement value of the clutch is minimum, the rotating speed of the rotating shaft is zero, and the clutch is completely separated; the displacement value of the clutch is gradually increased along with the output of a clutch combination instruction from the calibration device to the electromagnetic valve of the clutch, and when the displacement value of the clutch is increased to a certain point, the rotating speed of the input shaft is gradually increased until the rotating speed is the same as the rotating speed of the engine; and when the total change amount of the rotation speed of the input shaft is greater than a set threshold value, the corresponding displacement value of the clutch is the clutch combination grinding point.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.